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        var lon = 5;
        var lat = 40;
        var zoom = 5;
        var map, layer;

        var numLoadingLayers = 0;

        function init(){
            map = new OpenLayers.Map( 'map' );
            layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
                    "http://vmap0.tiles.osgeo.org/wms/vmap0", {layers: 'basic'});

            layer.events.register('loadstart', this, onloadstart);
            layer.events.register('loadend', this, onloadend);

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  <body onload="init()">
    <h1 id="title">WMS loadstart/loadend events</h1>

    <div id="tags">
        wms, layer, singletile
    </div>
    <p id="shortdesc">
        Shows the loadstart and loadend events of a WMS layer
    </p>

    <div id="map" class="smallmap"></div>
   
    <div id="docs">
        <p>
          This example is helpful in testing whether all loadstart events are followed
          by a loadend event.
          Test by using scroll-wheel up and down.
        </p>
    </div>

    <h1>loadstart and loadend events</h1>
    <pre id="output"></pre>

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